Chain



(No Model.) v

C. H. BRAMPTON..

v DRIVING CHAIN.

No. 449,997. Patented Apr. 7, 1891.

Tn: noms versus co., moro-ump., manwamn, u. c.

UNITED STATES PATENT OEEICE.

CHARLES HENRY BRAMP'ION, OF BIRMINGHAM, ENGLAND.

DRIVING-CHAIN.

A SPECIFICATION formingpart of Letters Patent No. 449,997, dated April '7, 1891.

lApplication filed November 18, 1890. Serial No..V 371,777. (No model.) Patented in England February 26, 1890, No. 3.060.

To all whom it may concern:

Beit known that l, CHARLES. HENRY BEAME- TON, manufacturer, of the rm of F. W. Brampton du Co., 14 Oliver Street, Birmingham, in the countyr of IVarwick, England, and a subject of the Queen of Great Britain, have invented certain new and useful Improvements `in Driving-Chains, (for which I have obtained a patent in Great Britain, dated February 26,1890, No. 3,060,) of which the following is a specification.

My invention has for its object improvements in driving-chains which are applicable to such purposes as the driving of bicycles, tricycles, and other velocipedes and machinery and is constructed to distribute the wear over a large surface by a particular formation of the parts and construction ot the chain. It is as follows: Every other link of my chain has a large hole bored through it, indeed as large as the eye of the link will allow, and the intermediate or outside links have the usualsized or smaller holes in them to correspond with the size of the pivot or joint pin used.

Upon the pivot or joint pin I shrink or otherwise fasten two hardened steel or other metal washers, one at each end,in combination with a central anti-friction roller placed upon the pin between-the two hardened washers, so that it will turn and run easily. I then place on each side one of the inner links having the large holes to drop easily with a good but free iit upon the hardened washers when the outer or small-holed coupling-links are placed upon the projecting ends of the pivot-pins and are there riveted or otherwise so thoroughly fastened that the pins cannot turn therein. The bend of the chain therefore takes place in the large links outside the hardened washers, thus producing a much larger wearing-surface than there would otherwise be. The anti-friction rollers ofcourse are loose upon h the pins to turn round as the chain works,

and they may be solid or bent round.

In order that my invention may be clearly understood and more easily carriedinto practice, I have appended hereunto a sheet of drawings, upon which Ihave fully illustrated the nature of my said improvements.

Figure 1 is a side elevation of a piece of l my chain in its complete state. Fig. 2 is a front elevation of same. Fig. 3 is an elevation of the center pin.. Fig. 4. is an elevation of the center pin having on it the Washer at one end. Fig. 5 is au elevation of the center pin having on it the Washer at both ends and-the intermediate friction-roller. Fig. 6 is a horizontal section of the length of the chain, but showing the pins and washers in elevation. Fig. 7 is a section of a link, showing a modiiication in the pivot. Fig. S is an elevation of the center pivot-piece used in the chain shown by Fig. 7. Fig. 9 is a similar elevation to Fig. 7, showing a further modication. Fig. 10 is an elevation of the inner link A. Fig. 1l is an elevation of the outer lilik B.

In carrying my invention into effect each ot' the links A is provided with the enlarged ends co2, through which the-hole d is bored as large as the ends a2 of the links will admit of. The intermediate or outside links B are provided Wit-h the usual-sized or smaller holes to correspond with the size of the pivot or joint pin E. Upon the pivot or joint pin E I shrink or otherwise fasten the two hardened steel or other metal washers e', one at each end against the shoulders es and c4 of the pin, between which the central anti-friction roller F is mounted to turn or run easily upon the pin E. The inner links A are mounted with their large holes a upon the hardened washers c', so as to have a good easy lit, the outer or small-holed coupling-links B being placed upon l the projecting ends e5 and e6 of the pivot-pins E, and are riveted sufficiently tight against the washers e to prevent the pins E turning therein. The bend of the chain therefore takes place in the eye a of the large links A and outside the hardened Washers c', thus producing a much larger wearingsurface at the movable joint than there would otherwise be. One of the washers c may be solid with the pin E, and the anti-friction roller F may be solid and drilled or bent round into the required shape.

In Figs. 7, 8, and 9 the enlarged bearings e2 are formed in one with the centcrf; or they may be formed separately, the couplinglinks A being first placed upon the bearings e2 and the links B placed at each end. The

outer links Band the transverse pins E,

vwhioh are riveted thereto, and circular en- Y largements e formed on them, with the roller F and the inner links A, which have enlarged openings a formed in them near their ends to receive the enlargements e', which allow said links to turn freely 011 them as the chain bends, affording ample bearing-surface, substantially as set forth.

In testimony that I claim the foregoing as my own I affix my name in the presence of two witnesses.

CHARLES HENRY BRAHPTON.

Witnesses:

LEWIS WM. GooLD, GEORGE PRICE. 

